buffer-list destroyed message

buffer-list destroyed message

[Thayne Harbaugh]

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I have a system that spits out the following error message:

scsi_end_request: buffer-list destroyed

It appears to come from drivers/scsi/scsi_lib.c: __scsi_end_request()

I can see that the code detects a mis-match in the number of sectors. 
I'm wondering if anyone can enlighten me on how serious this problem is
(the machine appears to work fine), what might be causing the problem,
and how I might fix things.

I searched the archives and only found one mail that seemed relevant:

http://marc.theaimsgroup.com/?l=linux-scsi&m=93303946423398&w=2

The comment for the MegaRAID refers to SMP and that the system appears
to continue to function with no problems - two symptoms of the machine I
have.  Yep, not a lot of information.

Additional information is that the SCSI disk has been swapped twice -
all three disks had the same errors.  The cable has been swapped and the
SCSI controller (aic7899 Ultra 160 - Tyan 2462 built-in) has been
swapped (motherboard was swapped).


-- 
Thayne Harbaugh
Linux Networx

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Re: buffer-list destroyed message

[Jens Axboe]

On Fri, Apr 25 2003, Thayne Harbaugh wrote:
> I have a system that spits out the following error message:
> 
> scsi_end_request: buffer-list destroyed
> 
> It appears to come from drivers/scsi/scsi_lib.c: __scsi_end_request()
> 
> I can see that the code detects a mis-match in the number of sectors. 
> I'm wondering if anyone can enlighten me on how serious this problem is
> (the machine appears to work fine), what might be causing the problem,
> and how I might fix things.

The problem is very serious and is usually accompanied by data
corruption. So I suggest you check your filesystems! It depends on the
driver, though. I can say with absolute certainty that a healthy system
should _never_ see those messages.

> I searched the archives and only found one mail that seemed relevant:
> 
> http://marc.theaimsgroup.com/?l=linux-scsi&m=93303946423398&w=2
> 
> The comment for the MegaRAID refers to SMP and that the system appears
> to continue to function with no problems - two symptoms of the machine I
> have.  Yep, not a lot of information.

So almost certainly a megaraid bug. Is is easily reproduceable? Does it
occur with a UP kernel?

-- 
Jens Axboe

Re: buffer-list destroyed message

[Thayne Harbaugh]

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On Sat, 2003-04-26 at 03:25, Jens Axboe wrote:
> On Fri, Apr 25 2003, Thayne Harbaugh wrote:
> > I have a system that spits out the following error message:
> > 
> > scsi_end_request: buffer-list destroyed

Sorry for the extra noise - just wanted closure on this.

My previous emails failed to state which kernel was in use.  If I had
stated it I would have been wrong.  I thought the machine was running
2.4.20 - it was, however, running 2.4.14.  Updating to 2.4.20 fixed the
problem: no more "buffer-list destroyed" messages are being sent.

FWIW

-- 
Thayne Harbaugh
Linux Networx

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